1,721,008 research outputs found
Long-term results of a prospective study on the treatment of medulloblastoma in adults
No full textAbstract
BACKGROUND:
Because medulloblastoma (MB) is rare in adults, the few studies on this condition have been retrospective, and the follow-up has tended to be short. Furthermore, the different therapeutic strategies used in these patients has made it difficult to assess survival rates and prognostic factors.
METHODS:
In 1989, a prospective Phase II trial was initiated to evaluate the efficacy of treatment for adults with MB. Patients were staged completely with a neuroradiologic examination of the brain and neuroaxis and by cerebrospinal fluid cytology, according to Chang's staging system. Low-risk patients received radiotherapy alone, whereas high-risk patients received 2 cycles of upfront chemotherapy followed by radiotherapy and adjuvant chemotherapy. The current article reports on the long-term results from that trial.
RESULTS:
After a median follow up of 7.6 years, among a total of 36 adults with MB, the overall progression-free survival (PFS) and overall survival (OS) rates at 5 years were 72% and 75%, respectively. In low-risk patients, the 5-year PFS rate was 80%, and the 5-year OS rate was 80%; in high-risk patients, the 5-year PFS rate was 69%, and the 5-year OS rate was 73%.
CONCLUSIONS:
In adult patients with MB, long-term follow-up was essential for evaluating the real impact of treatments. Low-risk and high-risk patients did not differ significantly in terms of PFS or OS
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Temozolomide three weeks on and one week off as first line therapy for patients with recurrent or progressive low grade gliomas
No full textAbstract
BACKGROUND:
Patients with recurrent or progressive low grade gliomas survive for a decade or more following diagnosis, and may be at a higher risk for treatment-related complications, such as cognitive impairment from radiotherapy.
PURPOSE:
The aim of the present study was to determine in patients with progressive or recurrent low grade gliomas, the response rate and toxicity incurred by a continued schedule of temozolomide chemotherapy administered before radiation therapy, and to explore correlations between response and survival with 1p/19q deletions and MGMT promoter methylation status.
METHODS:
Progressive radio and chemotherapy naïve low grade glioma patients with O(6)-methyl-guanine-DNA-methyl-tranferase (MGMT) promoter status evaluation were considered eligible. Chemotherapy cycles consisted of temozolomide 75 mg/m(2)/daily for 21 days every 28 days for 12 cycles.
RESULTS:
A total of 30 patients (median age 45 [range: 24.2-68.6] years) with a median KPS of 90 (range 60-90) were accrued. The overall response rate was 30% (9 partial responses); 17 patients (56.7%) had disease stabilization.
CONCLUSION:
The prolonged temozolomide schedule considered in the present study is followed by a high response rate; toxicity is acceptable. Further randomized trials should therefore be conducted to confirm the efficacy of this regimen as first-line therapy in patients with progressive low grade gliom
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
